Rad53 regulates replication fork restart after DNA damage in Saccharomyces cerevisiae

Szyjka, S. J., Aparicio, J. G., Viggiani, C. J., Knott, S., Xu, W., Tavare, S., Aparicio, O. M. (July 2008) Rad53 regulates replication fork restart after DNA damage in Saccharomyces cerevisiae. Genes Dev, 22 (14). pp. 1906-20. ISSN 0890-9369 (Print)0890-9369

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URL: http://www.ncbi.nlm.nih.gov/pubmed/18628397
DOI: 10.1101/gad.1660408


Replication fork stalling at a DNA lesion generates a damage signal that activates the Rad53 kinase, which plays a vital role in survival by stabilizing stalled replication forks. However, evidence that Rad53 directly modulates the activity of replication forks has been lacking, and the nature of fork stabilization has remained unclear. Recently, cells lacking the Psy2-Pph3 phosphatase were shown to be defective in dephosphorylation of Rad53 as well as replication fork restart after DNA damage, suggesting a mechanistic link between Rad53 deactivation and fork restart. To test this possibility we examined the progression of replication forks in methyl-methanesulfonate (MMS)-damaged cells, under different conditions of Rad53 activity. Hyperactivity of Rad53 in pph3Delta cells slows fork progression in MMS, whereas deactivation of Rad53, through expression of dominant-negative Rad53-KD, is sufficient to allow fork restart during recovery. Furthermore, combined deletion of PPH3 and PTC2, a second, unrelated Rad53 phosphatase, results in complete replication fork arrest and lethality in MMS, demonstrating that Rad53 deactivation is a key mechanism controlling fork restart. We propose a model for regulation of replication fork progression through damaged DNA involving a cycle of Rad53 activation and deactivation that coordinates replication restart with DNA repair.

Item Type: Paper
Uncontrolled Keywords: Cell Cycle Proteins/genetics/*metabolism Checkpoint Kinase 2 Chromatin Immunoprecipitation Chromosomes, Fungal/*physiology DNA Damage/*genetics DNA Repair/physiology DNA Replication/*physiology DNA, Fungal/genetics Gene Expression Regulation, Fungal Immunoprecipitation Methyl Methanesulfonate/pharmacology Oligonucleotide Array Sequence Analysis Phosphoprotein Phosphatases/*physiology Phosphoric Monoester Hydrolases/physiology Phosphorylation Protein Phosphatase 2 Protein-Serine-Threonine Kinases/genetics/*metabolism Replication Origin Saccharomyces cerevisiae/*physiology Saccharomyces cerevisiae Proteins/genetics/*metabolism/*physiology
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > DNA replication
organs, tissues, organelles, cell types and functions > cell types and functions > cell functions > cell cycle
Investigative techniques and equipment > Chromatin immunoprecipitation
organism description > yeast
CSHL Authors:
Communities: CSHL Post Doctoral Fellows
CSHL labs > Hannon lab
Depositing User: Matt Covey
Date: 15 July 2008
Date Deposited: 18 Mar 2015 15:24
Last Modified: 03 Nov 2017 20:18
PMCID: PMC2492737
Related URLs:
URI: https://repository.cshl.edu/id/eprint/31283

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